LP:669382 - Wrong result with join buffer (flat, BNLH join) and GROUP BY/LIMIT in maria-5.3-mwl128

The following query:

SELECT t1.col_int_key AS field1 FROM t2 JOIN t1 ON t2.pk WHERE t2.col_int_key = 143 GROUP BY field1 LIMIT 10;

When executed with join_cache_level = 4, returns 10 rows which are totally bogus since there is no row for which t2.col_int_key = 143. The explain reports "Using where; Using index; Using join buffer (flat, BNLH join)".